Abstract: A faucet 10 includes a brass support 42 mounted in a precise location in a housing 12 of the faucet. A slot 60 is formed in the brass support and receives a tab 64 of a color code ring 36 as the ring is positioned on top of a tower 18 of the housing 12 to properly locate the ring relative to the housing and to preclude rotation relative thereto. A shroud cover 19 is secured to the brass support 42 above the ring 60 to capture the ring between the cover and the top of the tower 18 and thereby preclude axial movement of the ring. Exterior surfaces 38 and 40 of the fixed ring 36 are formed with contrasting colors, such as "red" and "blue," which are clearly visible on opposite sides of the faucet 10. A handle 20 of the faucet 10 is located above the shroud cover 19 and is mounted for movement relative to the housing 12, the color code ring 36 and the shroud cover.

Abstract: A valve open/closed condition indication apparatus includes a handle base mounted at an upper portion of a bonnet of a valve and having a spiral guide formed on an upper face thereof, and a handle including a handle body disposed on the handle base and an open/closed condition indication plate disposed on the handle body and engaged with and slidably movable in a diametrical direction by the spiral guide of the handle base. When the handle is rotated, a projection of the open/closed condition indication plate of the handle is guided by the spiral guide formed on the handle base so that it is moved in a diametrical direction. When the valve is put into a fully open condition or a fully closed condition by the rotation of the handle, a symbol or color indication marked on the open/close condition indication plate or the handle body and representing the fully open condition or the fully closed condition is indicated accurately in an indication window formed in a name plate or some other suitable member.

Abstract: A position indicating valve wheel (1) having a digit ring (28) in rotating communication with an intermediate wheel (35), both of which are rotatably mounted in a wheel house (1). A driver (51) secured to a flange (48) of a decimal ring (40) which is also rotatably mounted in the wheel house (1). The driver (51) being engageable with the intermediate wheel (35) once every full rotation of the wheel house (1). A resilient collar (49) extending from the flange (48) and engageable with the wheel house (1). An exposed surface (29) of the digit ring (28) and an exposed flange (41) of the decimal ring (40) being located adjacent windows (20, 21) provided in the wheel house (1). A concentric sleeve (43) extended from the decimal ring and releasably mounted to a valve top piece (44).

Abstract: A valve having a magnetic force transmission apparatus is disclosed including: a closed body for tightly closing internal components and rotation shaft of the body of the valve, so as to interrupt the leakage of fluid from the valve and maintain perfect airtightness; and a pair of permanent magnet plates opposingly placed in the closed body and for allowing the valve open/close by transmitting power using the magnetic force of magnet pieces attached on yokes in non-contact.

Abstract: An air-flow meter for milking machines, comprising an enclosed housing with a connection to a line that is to be tested for flow and pressure and with an air-intake mechanism with a variable cross-section. The air-intake mechanism is an air intake with a slot-shaped cross-section. A rotating cylinder is accommodated inside the housing and operates in conjunction with the slotted intake. The cylinder has a breach that tapers out along a considerable length of its circumference. The longitudinal axis of the intake parallels the axis the cylinder rotates around, the free cross-section of the intake is only a fraction of length of the breach along the circumference of the cylinder, and any area of the breach can be aligned with the air intake by rotating the cylinder.

Abstract: A sliding flow controller for controlling flow through a pumping segment used in a fluid delivery system. The flow controller includes a slider that travels along a channel defined by an elastomeric membrane and a variable size groove formed in a rigid component. The slider includes a projecting ball that presses the membrane against the groove. At one end the groove has a maximum cross-sectional area for a maximum flow position and at another end, the groove has no cross-sectional area for a flow stop position. The slider and the pumping segment have respective click stops to impart sensory feedback to the operator when manually operated. A ramped thumb indentation is provided on the exterior of the slider to facilitate sliding movement.

Abstract: A manual control valve apparatus having a structure which is provided with, as a conversion mechanism, a diaphragm compressor which is held between a valve casing and a guide member, arcuate engaging grooves formed in a surface of the diaphragm presser opposite to the valve stem, and rolling elements which engage in a freely rolling manner in the engaging grooves and are supported by the lead end part of the valve stem. The bottom surfaces of the engaging grooves are made cam surfaces for causing reciprocating motion in the axial direction of the valve stem. An indicator possessing opening indicating portions indicating the rotational position of the valve stem is attached to the opposite end of the guide member from the valve casing, and furthermore, windows exposing the opening support portions are provided in an area from the circumferential wall of the handle to the end wall thereof.

Abstract: A warning announcer for a gasoline dispenser having a pump flow counter, a pump bar switch and/or a nozzle position sensor, a dispenser nozzle, and a nozzle receptacle, including a logic unit, a timer, a speaker, a voice alarm unit for providing a message to the speaker, a circuit for connecting signals from the pump flow counter and the pump bar switch or position sensor to the logic unit for controlling the timer to produce a message signal, and a circuit for connecting the timer to the voice alarm unit for initiating a message when the timer produces a messages signals.

Abstract: A damper includes an elastic bladder which is attached to and surrounds a support element mountable in a ventilation duct. The bladder inflates when supplied with fluid to restrict the available air space within the duct, thus restricting airflow through the duct. The amount of restriction can be regulated by monitoring the degree of inflation of the bladder and by controlling the degree of inflation to provide the desired airflow restriction rate. The bladder may be inflated by supplying pressurized air to the interior of the bladder through the support element or by vaporizing a refrigerant in communication with the bladder. The damper may comprise a single bladder extending longitudinally through the duct or a plurality of bladders extending transversely across the duct.

Abstract: An apparatus is provided which includes a valve transmission designed to connect a valve actuator to a rotational valve. The valve transmission includes a pinion, a pair of stepped racks, and a lower gear, all within a housing. The pinion is designed to be driven by a rotating shaft of an actuator. The pinion engages the teeth of the racks on the upper steps. The lower steps of the rack are displaced laterally from the upper steps to engage a lower gear that is either of lesser or greater diameter than the pinion depending on whether a positive or negative mechanical advantage is desired. The lower steps drive the lower gear which is connected to the drive shaft of a rotational valve. The transmission is placed within a housing which removeably mounts to the valve body.

Abstract: An improved live load packing system for sealing an operating valve member in a fluid valve A packing follower includes a base and a guide sleeve adapted for slidable engagement on the operating valve member. A series of Belleville disk springs slidably engage the guide sleeve and maintain concentric mounting during loading of V-type TFE packing members to ensure uniform concentric spring loading and to prevent undesired side loading.

Abstract: A valve stem driving apparatus comprises a valve stem which has first and second ends, the second end being connected to a valve body. The valve stem is engaged with a stem nut. A distance measuring device is provided in an upper cover for the valve stem and measures a distance between the upper cover and the first end of the valve stem, so that wear rate of the valve stem and/or the stem nut is determined.

Abstract: A position indicator apparatus for a valve of the type having a valve housing and a valve element, includes an actuator spindle fixedly secured to the valve element of the valve and an indicator spindle operatively connected to the actuator spindle. The indicator spindle is guided in a bush which is provided with an external thread for engagement to the valve housing of the valve. The upper end of the indicator spindle is provided with a complementary ribbed crown which protrudes a ribbed stationary guide member. A stroke of the valve element is transmitted to the actuator valve which in turn forces the indicator spindle upwards so that the ribbed crown moves past the perimeter of the guide member for displaying the respective position of the valve.

Abstract: A variable rate "on the go" fertilizer application controller for use with an agricultural earth working implement comprising a controlled metering device mounted on the implement. The control includes a reversible motor that operates a valve in the meter and at the same time a power take-off from the valve actuator drive operates a calibrated dial indicator to be interpreted by an operator so that action may be taken by a remote control device to make adjustments to compensate for variable soil conditions to get optimum crop production.

Abstract: A valve operating mechanism produces a rotating force for causing a valve body of the valve to shift relative to a valve seat thereof, so that the valve is opened and closed. A piston of the mechanism produces a rectilinear reciprocating force. A screw member is supported moveably along the rectilinear line and unrotatably in the housing and includes a pair of pawls helically projecting along the rectilinear line and a helical interval space defined between the helical pawls. A pivot is inserted into the helical interval space. A cylindrical rotating member is supported rotatably and unmoveably along the rectilinear line in the housing so as to surround the screw member. When the screw member receives the rectilinear reciprocating force to perform the reciprocating motion along the rectilinear line, the pivot is urged to rotate along the helical interval space in the rectilinearly unmoved state, and the cylindrical rotating member can rotate with the pivot.

Abstract: An enclosed gate valve for handling dry particulate material has a rectangular housing, and a curved flow control blade moves through the housing adjacent a housing inlet. The flow control blade is moved by an air cylinder mounted on an inclined and laterally offset wall of a housing compartment. A direct connection is formed between the piston rod of the air cylinder and the arm means supporting the curved flow control blade so that force from the cylinder is applied directly to the blade along a line of movement which is substantially tangent to the arc of blade movement to provide maximum advantage of the power available from the air motor in both the opening and the closing directions. Embodiments are shown of coupling arrangements for attaching the piston rod of the air motor to the blade arms. An indicator pointer provides a visual indication of the movement of the curved blade.

Abstract: The invention defines a position-indicating valve handle that is adapted to be mounted to the free end of a valve stem, wherein the handle includes a spiral groove in which a steel ball is free to move when the handle is turned by gravitational or magnetic force so that the ball will remain at a fixed point within the spiral groove (such as the lowest point where the handle is angularly disposed to the horizontal and gravitational force is used) as the handle is rotated. A transparent plate with indicia thereon is positioned to cover the spiral groove and allow the operator to visually determine by means of the location of the ball the approximate position of the valve stem within the body of the valve.

Abstract: An improved live load packing system for sealing an operating valve member in a fluid valve. A packing follower includes a base and a guide sleeve with a non-metallic inner liner adapted for slidable engagement on the operating valve member. A series of Belleville disk springs slidably engage the guide sleeve outer diameter and maintain concentric mounting during loading of V-type TFE packing members to ensure uniform concentric spring loading and to prevent undesired side loading. A window permits viewing the position of the guide sleeve and inner liner during packing loading adjustment so that optimum loading can be attained and maintained when the viewer notes the top edge of the guide sleeve and inner liner is flush with the top surface of the packing flange.

Abstract: In accordance with an illustrative embodiment of the present invention, a restriction sub apparatus for use during well cementing operations includes a tubular body having upper and lower internal recesses, a restriction ring having a shoulder engaged with the upper recess, and depending, inwardly inclined fingers at its lower end, and a back-up rubber ring mounted in the lower recess that yieldably resists expansion of the fingers as the drive plate of a displacement plug passes downward therethrough to provide a positive surface indication in the form of a pressure change that the plug is located at a particular depth.

Abstract: In a device for controlling a volumetric rate of flow in a guide tube (1), in particular for controlling the volumetric flow of air in a ventilation system or an air-conditioning plant, an adjusting flap (5) is to be arranged variably, in particular rotatably about an axis of rotation (6), in the guide tube (1). In this case, the guide tube (1) is assigned an adjusting device (3) for the adjusting flap (5) and the adjusting device is assigned a controller (4) which can be controlled by a control unit, in particular a room thermostat.

Abstract: A valve apparatus for solving a problem relating to fugitive emissions from sliding stem valves provides a valve body and a vertically extending, vertically slideable stem member that actuates a valving member between open flow and closed flow positions. The stem extends at generally right angles to the overall direction of flow through the valve body. A laterally extending valve bonnet is affixed in a sealable fashion to the valve body and forms a fluid tight seal over the valve stem. The end portion of the stem removed from the valving member carries a large magnetically moved piston which closely approximates the internal diameter of the bonnet. An external, preferable annular magnetic member slides between open flow and closed flow positions on the outside of the bonnet, its magnetic field sliding with the internal piston in order to open and close the valve. A valve position indicator or transmitter either indicates or transmits the position of the valving member at all times.

Abstract: A hinged two piece structure to remind an operator that a valve is on is disclosed. The valve shut-off flag is retained to a valve by a simple clamp and is therefore readily adaptable for use on many different types of valves, although the preferred embodiment has application on oxygen-acetylene torch sets. One piece of the structure acts as a support column for a hinge and a second piece of structure. The second structure piece partially covers the valve when the valve is in the closed or shut position. In order to turn on the valve, a user must lift the second structure piece to an upright position where it extends substantially beyond the valve. The second structure piece is of sufficient surface area and colored appropriately so as to catch the eye of a user.

Abstract: A non-invasive system and method is provided for the inspection of check valves which combines acoustic and magnetic techniques. The acoustic and magnetic techniques are used to measure check valve disk motion and internal impacts or vibrations resulting from the disk motion.

Abstract: A self-contained electronic air register controller can easily be mounted directly onto the outside of an air register. When so mounted, the controller engages the register's actuating lever and permits automatic opening and closing of the air register by way of simple programming instructions and/or by way of a temperature sensor. The controller comprises a small battery, a miniature electric motor with a gear/linkage mechanism operable to engage with and to move the register's actuating lever between its OPEN and SHUT positions, and a quartz-clock-based programming means.

Abstract: In accordance with illustrative embodiments of the present invention, restriction subs for use in setting cement plugs in wells include a tubular threaded adapter having an internal annular recess, and a metal restriction sleeve mount in such recess. In one embodiment, the sleeve has a corrugation that extends into the bore of the adapter to provide a deformable restriction; in another embodiment the sleeve has curved resilient tabs whose free ends extend into such bore. The restrictions are cooperable with a displacement plug having a metal expander member on its nose so that a distinct pressure is required to cause the expander member and plug to be forced through the restriction.

Abstract: A deck box valve operator and position indicator assembly characterized by a sprocket (66) supported by the housing (18) on a plateau (70) adjacent the spindle means (46) and having a plurality of radial forked (74) arms (72) with arcuate peripheries (76) extending between adjacent arms to extend about the circular circumference (78) of the spindle means (46). The spindle means (46) has a concaved recess (80) interrupting its circular circumference in an annular groove extending above the spindle means (46) for receiving the arms (72) of the sprocket (66). A gear train interconnects the sprocket (46) and an indicator ring (62) rotatably disposed in the housing for establishing a ratio between the number of revolutions of the spindle means (46) and the ring indicator (62) means whereby the ring (62) indicates the position of a valve means (12) between open and shut.

Abstract: A device for measuring cycles of random reciprocal motion of an object, such as a control valve which moves in discrete movements of varying length between an opened and closed position, includes a cylindrical travel translator member biased within a housing by a coil spring to maintain tension on a cable connecting the travel translator member to the object, so that the travel translator member moves in a direction corresponding to and a distance proportional to that of the object. An elastomeric wheel frictionally engages the travel translator member to rotate a shaft which operates a mechanical counter, and through a cam, a limit switch which generates pulses representative of the random cycles of the object.

Abstract: A quick-action valve is opened and closed by a quarter turn. Safe closing with high mechanical advantage is provided, while the valve member is removed completely from the path of the flow upon valve opening. The valve member is fixed to a valve arm, mounted for rotation on a shaft. The valve includes an auxiliary shaft around which an actuating arm with a roller fixed to it are turnable. The roller moves the valve arm, or an auxiliary arm connected to it, so that upon closing it rolls substantially tangentially on a camming surface, thus bringing about maximum force transmission. A few degrees after the dead center position, rotation of the actuating arm is limited by a stop, and self-holding takes place in the closed position. In a preferred version the roller runs in the groove on the valve arm or auxiliary arm.

Abstract: A valve choke actuating device utilizes a stepping actuator with a feedback control system. A command signal and a feedback signal are compared to produce a train of electrical pulses proportional to the difference in the signals. The train of pulses are utilized to actuate piston-cylinder assemblies to control the opening of the choke.

Abstract: A position indicator for and method for applying the same to valve arrangements having a first strip attached to a first movable part and a second strip attached to a second stationary part of the valve arrangement. The strips have a line arranged down the middle with contrasting lines on either side for easy alignment of the indicator strips. The indicator strips are initially applied as a single strip to the first and second parts of the valve arrangement and then severed at a point between the first and second parts when the valve arrangement is in a known preferred position.

Abstract: A radiator valve having an enclosed pre-adjustment arrangement. In the valve body (10) a plastic insert (36) is disposed, having a coaxial, conical inner surface (38) and a projection (40) provided with a flow opening (34). The flow opening is made with a desired accuracy of size and surface smoothness. The pre-adjustment spindle (12) has a conical member (44), including a shield member (52), the height of which increases continuously. The shield member (52) is adjusted in order to cover up a larger or a smaller portion of the flow opening (34) and is locked by means of a tightening nut (62).

Abstract: There are disclosed several embodiments of a fail safe gate valve and actuator having means for yieldably urging the gate from one position to which it is moved under one or more controlled conditions to its other position upon failure of one such condition, means including a handwheel mounted on the actuator for moving the gate to its one position, and means automatically responsive to a control signal for rendering the handwheel inoperative to move the gate to its one position upon reestablishment of said one controlled condition. In certain embodiments, the control signal is automatically responsive to the reestablishment of said one controlled condition; and, in another embodiment, it is automatically responsive to the failure of said one controlled condition. The controlled conditions are disclosed as being one or both of a predetermined fluid pressure condition, and or a predetermined environmental temperature condition.

Abstract: A liquid distributing apparatus, particularly for incorporation in lids or covers of 3 to 5 gallon containers, has a four-way input valve for delivering water under pressure to wash hands, clean materials, etc., fill the tank on which the lid is placed and to drive rotor shafted to a spur gear which drives an agitator for keeping the concentrate in the tank stirred-up, with a manual input for initially stirring-up or agitating the concentrate. An indicator is provided on the manual drive to show that the agitator (and hence the rotor) is operating. An aspirator or jet pump receives the liquid or water downstream of the rotor and the input aspirator or vacuum line from the concentrate or tank passes through a ball check valve which has an indicator coupled thereto for indicating the flow of concentrate from the tank to the jet pump to be mixed with the water. A valve with predetermined controls the degree or ratio of concentrate.

Abstract: The invention disclosed herein relates to a check valve actuator for opening and closing a check valve, utilizing system pressure. The check valve actuator is comprised of a piston connected to a clapper assembly by a connecting rod. The piston is slideably received in a piston cylinder containing a control valve and a latching stem. A protective cage and a protective cover are mounted over the piston cylinder.

Abstract: A piggyback IV administration system uses a solenoid actuated sequence valve to control the flow of fluid from a pair of IV fluid sources to the inlet of an IV pump or controller. The sequence valve pinches off a first tube while allowing fluid to flow through the second tube and then, in response to a control signal, changes state so that the second tube is pinched off and fluid can flow through the first tube unimpeded. The sequence valve automatically senses conditions which indicate a failure of the sequence valve to occlude the second tube when the valve changes state.

Abstract: A supervisory alarm accessory for a fire sprinkler stop valve of the type including a rotatable valve actuator driving a valve spindle. The accessory contains an adaptor sleeve connectable between the actuator and the spindle to rotate with the actuator. The adaptor sleeve has an externally threaded part, and a fixed housing supported on the sleeve to permit relative rotation of the sleeve and enclosing the threaded part. A follower is threadably engaged with the threaded part and keyed to the housing. An alarm generator, and activating arrangement are supported on the housing and provide an activating connection between the alarm generator and the follower to initiate an alarm.

Abstract: A ram-type blowout preventer having a removable seal insert contained in an insert cavity formed in the forward end of the ram body. Each seal insert includes an elastomeric body which forms an inner seal portion having a forward seal face and two outer seal portions which extend laterally into slot openings in the ram body. In each seal face is set a rigid cup which defines a cup-shaped cavity. When the rams are brought together to close the valve the two cups join together rim-to-rim to form a grease chamber between the seal forces.

Abstract: A differential fluid pressure indicator including a bypass valve which provides an indication that the filter is in the bypass condition. The bypass valve includes a differential area piston which includes at the outlet port thereof a restriction orifice adapted to insure a predetermined stroke of the poppet in the bypass valve, thereby to insure actuation of the indicator.

Abstract: The invention relates to a sequentially controlled water mixer comprising a valve housing (1) with a cold water inlet connection (2) and a hot water inlet connection (3), and a common outlet (4), said casing defining a mixing chamber (5) between the inlets and outlet with a regulating chamber (6) located on the inlet side for housing an adjustable regulating switching valve (7) of substantially rotationally-symmetrical shape and with regulating apertures (8,9), said valve being adjustable to seal-off the inlet connections (2,3), or to control flow through the connections via said apertures (8,9). According to the invention the said inlet connections define recessed holes of larger dimension than respective hot and cold water pipes to be used therewith, and each hole accommodates a compression spring (27) and a seal (28) loaded by the spring to rest in contact with said switching valve (7) via a sealing surface which follows the contour of said switching valve.

Abstract: A gate valve with inlet and outlet body portions with annular valve seats thereon and a gate assembly movable between open and closed positions between said body portions and carrying sealing rings in opposite faces thereof adapted to be brought into sealing relationship with said valve seats when the valve is open and when the valve is closed. The body portions of the valve have a plurality of bolts passing therethrough which are adapted to threadably engage the sealing rings to uniformly draw the rings toward their respective valve seats to clamp a gasket structure between a ring and its seat in positive sealing relationship. The bolts are adapted to be withdrawn from the rings to permit the gate assembly to be moved between open and closed positions.

Abstract: Disclosed is a method and apparatus for indicating the position of a hydraulically actuated device by measuring the volume of hydraulic fluid flow in and out of the hydraulic actuator together with separate measurement corrections to compensate for the hydraulic system elasticity and transient flows and for the mechanical clearance or slop in the linkage between the actuator and the device. In a preferred embodiment of the method, the compensation for hydraulic system elasticity and transient flows is preferably made by measuring the relaxation reverse flow when the actuator is depressurized and using this measurement to offset an equal amount of the measured forward flow when the actuator is repressurized in the same direction. Further, the compensation for mechanical clearance in the linkage between the actuator and the device is applied only when the actuator direction is reversed; the amount of such compensation is empirically determined and may increase with wear and tear on the linkage.

Abstract: A low emission valve assembly for use with volatile fluids and incorporating a pair of independent inner and outer metal bellows mechanical seal assemblies with means to compensate for thermal expansion of a liquid between the seals and which means transmits product pressure within the valve to the seals, so that the inner seal floats with a near zero pressure differential from outside to inside. The compensating means can be a pressure responsive bellows arrangement or a pressure response diaphragm arrangement.

Abstract: A multi stage valve(1) having a valve member actuating mechanism located on the wide side of the valve member;(2) having a valve member and seat equipped with plural steps of increasing diameter in an upstream direction;(3) wherein the steps are configured so that a straight line can extend between opposed steps in all open positions of the valve;(4) wherein the steps are configured so that the flow passage varies in width, being narrowest at the zones of opposed steps;(5) wherein the movement of the valve member is of a magnitude equal to the width of plural steps;(6) having a movable assembly which includes the valve member and its actuating mechanism adapted for ready reception by valve bodies of various configurations;(7) having an arrangement for balancing the pressure across the valve member when it is closed;(8) having an arrangement for exteriorly showing the exact position of the valve member at all times;(9) having other features as recited herein.

Abstract: There is disclosed an apparatus for manually locking a pilot valve in an "in service" position independent of an actuating, or pilot fluid pressure. The apparatus may be either manually disengaged or will be automatically disengaged whenever the ambient temperature exceeds a predetermined level. The device includes a valve manipulating knob attached to the exterior end of a valving element for manually shifting the element from a normally closed position to the in service position. The knob includes an "L" shaped locking member which conforms to the contour of the knob, and is adapted to pivot towards the valve body and lock the valving element out in the "in service" position. This pivotal member includes an indicating surface visible from the front when the valving element is locked in an "in service" position. The locking member is comprised of a fusible material selected to yield at a predetermined temperature so as to return the valve to an operating mode responsive to the pilot fluid pressure.

Abstract: One or more grooves are provided to weaken a portion of the stem nut, retaining nut, or yoke bush in a disk/gate valve to provide selective breakage to limit axially directed forces transmittable through the stem and stem connection. Clearances between the valve body and the non-weakened nut or bush portion to permit axial movement of the latter relative to the former following breakage to provide visual indication of breakage.

Abstract: Compressed gas saving device designed to be implanted in a pipe system connecting a control valve outlet to the inlet of a pressure-user apparatus constituted by a body in which a first passage is provided which passage starts from a first end of the body, provided with means connecting it to the control valve, towards a second end of the body, provided with means connecting it to the said pipe system, the first passage traversing a seat provided in the said body, and adapted to be closed off by a valve returned on the said seat by a spring member, the effect of which is adjustable in intensity by means of a hand-operated adjusting member and tends to oppose the rising force of the valve head generated by the gas flowing from the control valve, whereas a second passage, provided in the body, constitutes a bias of the said first passage, short-circuiting the aforesaid valve head provided with a one-way valve whose flowing direction is that of the gas issued from the pressure-user apparatus, the said adjusting

Abstract: A valve (20) having a flow control element (30) with a small dimension in the intended direction of fluid flow is disclosed. The element (30) is wound about an axis (32) so that, when the coils of the element (30) are tightly compressed about the axis (32), a surface (48) occluding a fluid flow aperture (24) is formed.

Abstract: A pressure relief device for use on a liquid filled vessel, such as a power transformer having a coolant oil enclosed, which device includes a clamp arranged on the device so that the pressure relief function of the device is negated until the clamp is removed.

Abstract: An improved control line blow out preventer valve is provided, having a fluid pressure chamber interposed in a control line extending from a surface control panel to a downhole safety valve in a subterranean well. Axially spaced inlet and outlet openings are provided in the pressure chamber and a piston is reciprocally mounted intermediate the inlet and outlet openings. A sealing plug carried by the piston cooperates with a seal surrounding the inlet opening. A bypass passage through the piston mounts a check valve which permits free fluid flow in the direction from the control panel to the subsurface safety valve but only a restricted fluid flow in the opposite direction. A check valve is mounted in the outlet passage to prevent fluid flow from the subsurface safety valve to the control panel. A fusible link normally maintains this check valve off its seat so that it does not close until the occurrence of an elevated temperature caused by fire.

Abstract: A manually operated valve. The valve has a housing with a uniform outside diameter compatible with the outside diameter of flow conductors attached to the valve. An operating sleeve is movable longitudinally within the housing by engagement with a shifting tool from the exterior of the housing. The operating sleeve shifts the valve between its open and closed positions. A detent spring is provided to give an indication when the shifting tool has moved the operating sleeve sufficient to fully open or close the valve. The valve is particularly adapted for using in a drill string or workover string in an oil or gas well.